/**
 * Licensed to Apereo under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright ownership. Apereo
 * licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use
 * this file except in compliance with the License. You may obtain a copy of the License at the
 * following location:
 *
 * <p>http://www.apache.org/licenses/LICENSE-2.0
 *
 * <p>Unless required by applicable law or agreed to in writing, software distributed under the
 * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apereo.portal.concurrency;

import org.apereo.portal.IBasicEntity;

/**
 * Defines an api for a caching service that caches and retrieves <code>IBasicEntities</code>.
 * Cached entities of a given type are stored in an <code>IEntityCache</code>. The service manages
 * access to these caches and is respon sible for initiating any cache clean up or invalidation.
 *
 * <p>The actual caching api is minimal:
 *
 * <p><code>
 *      void add(IBasicEntity entity);<br>
 *      IBasicEntity get(Class type, String key);<br>
 *      void remove(Class type, String key);<br>
 *      void update(IBasicEntity entity);<br>
 * </code>
 *
 * <p>
 *
 * @see org.apereo.portal.IBasicEntity
 * @see org.apereo.portal.concurrency.IEntityCache
 */
public interface IEntityCachingService {

    /**
     * Adds the entity to the cache.
     *
     * @param ent org.apereo.portal.concurrency.IBasicEntity
     * @exception org.apereo.portal.concurrency.CachingException
     */
    void add(IBasicEntity ent) throws CachingException;

    /**
     * Returns the cached entity identified by type and key.
     *
     * @param type Class
     * @param key String
     * @return IBasicEntity entity
     * @exception org.apereo.portal.concurrency.CachingException
     */
    IBasicEntity get(Class<? extends IBasicEntity> type, String key) throws CachingException;

    /**
     * Removes the cached entity identified by type and key from the cache and notifies peer caches.
     *
     * @param type Class
     * @param key String
     * @exception CachingException
     */
    void remove(Class<? extends IBasicEntity> type, String key) throws CachingException;

    /**
     * Updates the entity in the cache and notifies peer caches.
     *
     * @param ent org.apereo.portal.concurrency.IBasicEntity
     * @exception org.apereo.portal.concurrency.CachingException
     */
    void update(IBasicEntity ent) throws CachingException;
}
